** Description changed:
- Binary package hint: vlc
+ The audio-sync function does not appear to work correctly in VLC 1.1.4
+ Ubuntu 10.10 Maverick.
+ [Symptom]
+ After initial audio/video sync up using audio-desync, the audio/video
+ sync drifts out noticably within a few minutes and significantly in an
+ hour or so.
+ * The standard Ubuntu Lucid 10.04 VLC 1.0.6 version performs correctly
+ * The MS windows (XP) version 1.1.4 performs correctly
- The audio-sync function does not appear to work correctly in VLC 1.1.4
+ [Test case]
- Ubuntu 10.10 Maverick.
+ A. Setup
+ * Same Hardware and software setup in both Ubuntu test cases
+ * Video in: PCI analog capture card (bt878video pci capture card,
Hauppauge VCB Impact)
+ * Audio in: Soundcard line-in
+ * Std desktop install Ubuntu versions using Std default repos
+ * +VLC, +ffmpeg libavdevice-extra52, +x264
+ * Broadcast TV analog out used as test input source. Video into capture card,
audio into sound card ( I would usually be using analogue camera and mic/line
in)
- Symptom
+ B. Procedure
- After initial audio/video sync up using audio-desync, the audio/video
- sync
+ 1. Open GUI, test video/audio capture, by "Open Capture device" - Play
- drifts out noticably within a few minutes and significantly in an hour
- or
+ 2. Select Streaming from menu, select Capture device tab, all input
+ settings left at default
- so.
-
-
- The standard Ubuntu Lucid 10.04 VLC 1.0.6 version performs correctly
-
-
- The MS windows (XP) version 1.1.4 performs correctly
-
-
-
-
- Test case
-
-
- Same Hardware and software setup in both Ubuntu test cases
-
-
- Video in: PCI analog capture card (bt878video pci capture card,
- Hauppauge
-
- VCB Impact)
-
-
- Audio in: Soundcard line-in
-
-
- Std desktop install Ubuntu versions using Std default repos
-
- +VLC, +ffmpeg libavdevice-extra52, +x264
-
- Broadcast TV analog out used as test input source. Video into capture
-
- card, audio into sound card ( I would usually be using analogue camera
- and
-
- mic/line in)
-
-
- Procedure
-
-
- 1 Open GUI, test video/audio capture, by "Open Capture device" - Play
-
-
- 2 Select Streaming from menu, select Capture device tab, all input
-
- settings left at default
-
-
- 3 select Stream, Next, Next , Paste output string into textbox, as
+ 3. select Stream, Next, Next , Paste output string into textbox, as
follows
+ --sout-keep --audio-desync=-40
+
:sout=#transcode{vcodec=h264,vb=600,deinterlace,ab=64,fps=25,width=160,height=120,acodec=mp3,samplerate=44100
+ ,audio-
+
sync}:duplicate{dst=std{access=http{mime=video/x-flv},mux=ffmpeg{mux=flv},dst=0.0.0.0:8082/stream.flv},dst=display}
+ * Audio-desync value adjusted to initial optimum value (predetermined before
test)
+ * Width and height set to low values to minimise cpu load
+ * Same procedure in all cases including Win XP. Win test using
similar hardware, bt878 pci capture card.
- --sout-keep --audio-desync=-40
-
-
:sout=#transcode{vcodec=h264,vb=600,deinterlace,ab=64,fps=25,width=160,height=120,acodec=mp3,samplerate=44100
-
- ,audio-sync}:duplicate{dst=std{access=http
-
-
{mime=video/x-flv},mux=ffmpeg{mux=flv},dst=0.0.0.0:8082/stream.flv},dst=display}
-
-
- Audio-desync value adjusted to initial optimum value (predetermined
- before
-
- test)
-
- Width and height set to low values to minimise cpu load
-
-
- Same procedure in all cases including Win XP. Win test using similar
-
- hardware, bt878 pci capture card.
-
-
- Appendix
+ [Appendix]
Suspected that pulseaudio may be the cause:
- Removed pulseaudio and installed alsa mixer. Problem persisted.
-
- Also tried VLC 1.1.5 from Maverick Bleed PPA. Problem persisted
-
- Also tried VLC 1.1.4 from Lucid Bleed PPA with Lucid. Problem here as
- well.
-
+ * Removed pulseaudio and installed alsa mixer. Problem persisted.
+ * Also tried VLC 1.1.5 from Maverick Bleed PPA. Problem persisted
+ * Also tried VLC 1.1.4 from Lucid Bleed PPA with Lucid. Problem here as well.
Reported problem to Videolan Trac
-
Response as follows.
-
-
- Changes (by courmisch): * status: new => closed* resolution: =>
- incomplete* component: I don't know => Access
+ Changes (by courmisch):
+ * status: new => closed
+ * resolution: => incomplete
+ * component: I don't know => Access
Comment: And I bet you get the same effect if you just render the inputs
- locally,no? Then I would tend to blame the V4L2 and ALSA input plugins
+ locally,no? Then I would tend to blame the V4L2 and ALSA input plugins
for not timestamping correctly. Or it might even be a driver bug.
-
Ticket URL: http://trac.videolan.org/vlc/ticket/4315#comment:2
-
- I did not see the problem when playing capture device, only when streaming.
+ I did not see the problem when playing capture device, only when
+ streaming.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: vlc 1.1.4-1ubuntu1.1
ProcVersionSignature: Ubuntu 2.6.35-23.41-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Mon Dec 6 23:18:34 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
- LANG=en_GB.utf8
- SHELL=/bin/bash
+ LANG=en_GB.utf8
+ SHELL=/bin/bash
SourcePackage: vlc
** Changed in: vlc
Importance: Undecided => Unknown
** Changed in: vlc
Status: Incomplete => Unknown
** Changed in: vlc
Remote watch: None => VLC Trac #4315
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https://bugs.launchpad.net/bugs/686248
Title:
Audio sync problem streaming ubuntu 10.10 VLC 1.1.4
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